A nurse is teaching a client who has a new prescription for phenytoin extended-release capsules. Which of the following instructions should the nurse include?

A. "Take the medication with an antacid if you have gastric distress.": Antacids can interfere with the absorption of phenytoin, reducing its effectiveness. It is not recommended to take phenytoin simultaneously with antacids. B. "Dissolve the capsules in water prior to taking the medication.": Extended-release phenytoin capsules should be swallowed whole to maintain the time-release mechanism. Crushing or dissolving the capsules can cause rapid absorption and increase the risk of toxicity. C. "Discontinue the medication if you experience a seizure.": Phenytoin should not be stopped abruptly, even if seizures occur, as this can precipitate status epilepticus. Any dosage concerns should be discussed with the healthcare provider before making changes. D. "Use a soft-bristled toothbrush to brush your teeth.": Phenytoin can cause gingival hyperplasia, leading to swollen and bleeding gums. Using a soft-bristled toothbrush and practicing good oral hygiene helps minimize gum irritation and maintain oral health.